<!DOCTYPE html>
<title>Reference for trimming block-boxes at their first/last formatted lines</title>
<link rel="help" href="https://drafts.csswg.org/css-inline-3/#leading-trim">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />

<style>
.div-parent {
  outline: 1px solid orange;
  font-family: Ahem;
  font-size: 20px;
  line-height: 1;
  writing-mode:vertical-lr;
}
</style>
<div class ="div-parent">
  Test<br><br>
</div>
